Man, this is reallly buggin me because i cant tell where or what its coming from. When i COLD start my car, i dont know if you have noticed, but upon cold starting, the Rpms's go a little higher than a normal warm start. And i am only talking about the part when you turn the key and get the VROOM. During that Vroom, i get a really loud rattle that sounds exactly like a heat shield being loose. But it cant be a heat shield because i just had a brand new X pipe installed. (It did this sound before with the stock midpipe also but i assumed it was a heat shield). It only does in for a second or two during the Vroom part of any COLD start up. And never does it if you rev, or tap the throttle or warm start. I cant even pin point the sound, but it sounds like the bottom part of the engine, because i can hear it louder when its reflecting the sound off the ground than i can standing over the hood. Any suggestions??
Rattle on startup
- Thread starter spederman
- Start date
I was thinking anti-drainback valve myself, but he said it sounds more like it's coming from the bottom of the engine, or under the car. I had a bad anti-drainback valve on a Mobil 1 filter a year or so ago, and it was valve noise, on the top of the motor.
trinity_gt
10 Year Member
Sounds related to the hated "death rattle" -- piston noise -- that some 2Vs are known for. My '02 does the same thing no matter what oil filter I use. I wager that if spederman investigated a bit deeper and tried listening for weirdly engine noises when cold, when driving at part throttle (<1/4) and virtually no load with the engine RPM around 2200RPM or so he'd probably hear the true "death rattle" too. It's piston slap.
As long as it goes away warm I wouldn't worry too much about it. But I'd also let the thing warm up before getting on it (which is good advice for any engine, rattley or not...)
As long as it goes away warm I wouldn't worry too much about it. But I'd also let the thing warm up before getting on it (which is good advice for any engine, rattley or not...)
hotrodnut
Member
Sorry for invading this post but I'd like to know about this TSB, any copies of it floating around?Kilgore Trout said:
It sounds to me like it's starving for oil at start up. I know on my Mach after an oil change I can hold the accelerator pedal to the floor and it will not start up. This allows the oil to pump up at a much lower RPM than if it just fired off preventing the initial starvation.
Hmm, I went and looked at the TSB seems it is for the 2V after all... Her are two TSBs that may apply to this thread:hotrodnut said:
15737
A Mechanical Noise (Buzz, Growl, Scraping, Zip) May be heard on drive away after initial start-up.
Some 1992-2002 vehicles equipped with anti-lock brakes may exhibit a mechanical noise (Buzz/Growl) on drive away after initial start-up. Each time the vehicle is driven. As vehicle speed reaches approximately 11-32 KM/H (7-20 MPH). The anti-lock brake control module turns on the pump motor and valves for approximately one half second. At this time a mechanical noise (Buzz, Growl, Scraping, Zip) maybe heard. This is a normal function of the self-check by the anti-lock brake control module for additional information refer to workshop manual section 206-09.
15738
Mustang 4.6L 2V cold start rattle
Some 2001-2002 Mustang GT equipped with a 4.6L 2V engine and a manual transmission, may exhibit a cold start piston rattle. Engineering is investigating this condition using the quicker service fix (QSF) process. Do not atttempt any service at this time. Continue to contact the national hotline to verify condition. A serice fix should become available in the second quarter sumbit EDSR's adn continue to monitor oasis for updated information.
trinity_gt
10 Year Member
KT, there's a follow-up to 15738:
"15934 MUSTANG- COLD ENGINE LIGHT TICKING/RATTLE
Some 2001-2002 Mustang GT and Bullitt with the TR3650 manual transmission may exhibit a light ticking/rattle noise while driving after a cold engine start. The noise will typically occur between 2200-3500RPM under light throttle (1/8 to 1/4 open) while driving. The noise may last a few minutes (depending on temperature). The condition is due to the combination of the light load operation noted above, and the normal piston to cylinder bore clearance present in a cold engine. To service, verify condition and reprogram the PCM with the latest calibration via the just-in-time process if your WDS communicates with Fordstar. Also obtain calibrations on the Ford professional technician society (PTS) website - select 'WDS' and then 'PCM REPROGRAMMING' and click 'Instructions' for downloading."
"15934 MUSTANG- COLD ENGINE LIGHT TICKING/RATTLE
Some 2001-2002 Mustang GT and Bullitt with the TR3650 manual transmission may exhibit a light ticking/rattle noise while driving after a cold engine start. The noise will typically occur between 2200-3500RPM under light throttle (1/8 to 1/4 open) while driving. The noise may last a few minutes (depending on temperature). The condition is due to the combination of the light load operation noted above, and the normal piston to cylinder bore clearance present in a cold engine. To service, verify condition and reprogram the PCM with the latest calibration via the just-in-time process if your WDS communicates with Fordstar. Also obtain calibrations on the Ford professional technician society (PTS) website - select 'WDS' and then 'PCM REPROGRAMMING' and click 'Instructions' for downloading."
DocG
5th graders > me. They're not bant
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